Question

how is the form of typhus caused by rickettsia transmitted from person to person?
a. bites of certain insects
b. touching an infected person
c. coughing and sneezing
d. fecal material

Explanation:

Typhus caused by rickettsia (specifically epidemic typhus) is transmitted through the fecal material of infected lice (when the lice's feces enter broken skin or mucous membranes). Insect bites (option a) are more for vector - borne diseases with different mechanisms, touching an infected person (option b) is not the main transmission route, and coughing/sneezing (option c) is for respiratory - transmitted diseases. So the correct option is related to fecal material.

Answer:

d. Fecal material